Hydromechanical perforating device and hydromechanical perforation method

Abstract

The claimed inventions relate to devices and methods for hydromechanically perforating wellbores. A hydromechanical perforating device comprising a housing, jet nozzles, a cutting assembly with discs, and a movement mechanism is lowered into a wellbore on a tubing string to a perforation site. Inside the tubing, a calculated pressure is imparted to a working fluid by means of a ball being positioned in a seat of a pusher piston, and the pusher piston acts on an upper deflecting wedge, moving the cutting discs out of the housing through elongate through-holes to form two longitudinal slots in the casing. Once jetting has been performed, the pressure of the working fluid inside the tubing is reduced to 0 atm and working fluid at the calculated pressure is pumped into the annulus from where it enters the lower part of the housing via an end opening to act on a lower pusher piston from below and to translate the pusher piston upwards, thereby moving the cutting discs into the housing. The technical result is an increase in the operating reliability of the device and the efficiency of perforation-related workover operations.

Description

[0001] Device for carrying out hydromechanical perforation and method for its implementation

[0002] The invention relates to the field of drilling and operating oil and gas wells, namely to devices for creating longitudinal perforation channels used to perforate several intervals of a formation in one trip, and can be used to create perforation slots in production and casing strings.

[0003] The prior art includes devices and methods for slot perforation of casing strings based on the use of a cutting tool in the form of a retractable knurling roller. Such devices are disclosed, for example.

[0004] A device for slot perforation of cased wells is known, comprising a housing with a cylinder and a piston, a retractable cutting tool, a hydraulic monitor nozzle, in the housing oriented holes of different diameters and side grooves are made (RU Patent No. 2151858, E21B 43 / 114, published on June 27, 2000).

[0005] A device is known for creating slots in the walls of a well, which includes a cylindrical body with a longitudinal slot, which is lowered on a pipe string, in which a rotary cutting element, a mechanism for extending the cutting element, a hydraulic cylinder with a piston are placed, wherein the hydraulic cylinder is made with a channel for communicating its above-piston cavity with the cavity of the pipe string, and the below-piston cavity is hydraulically communicated with the annular space (RU Patent No. 2030563, E21B 43 / 1 1, published 10.03.1995).

[0006] A hydromechanical downhole perforator is known, which includes a housing, a cutting tool, a hydraulic monitor attachment, a piston-pusher, which is made with central and lateral hydraulic channels and with the ability to interact with the cutting tool (RU Patent No. 2182221, E21B 43 / 114, published May 10, 2002).

[0007] Currently, some models of hydromechanical hammer drills are equipped with a return mechanism in the form of a spring mechanism, which facilitates the movement of the cutting parts of the hammer drill and its placement in the transport position.

[0008] The devices described above differ mainly in the design of the fastening mechanism and movement by means of rotation of the cutting tool.

[0009] The main disadvantage of the spring mechanism of the above-mentioned devices is the uncontrollability of the spring force and dependence on the reservoir pressure that facilitates placing the hydraulic cylinders in the transport position.

[0010] The closest is a hydromechanical slot perforator, comprising a housing, hydraulic nozzles, a cutting unit and a movement mechanism including upper and lower deflecting wedges, the cutting unit is located between the upper and lower deflecting wedges and includes a movable axis, a connecting element and two cutting disks, each of which is designed with the possibility of being placed and secured on the end sections of the connecting element, wherein the connecting element is designed with the possibility of placing and securing two cutting disks on its end sections and with the possibility of placing on the movable axis for rotation around it, the movable axis is fixed in the housing with the possibility of its rotation, the movement mechanism is installed in the housing with the possibility of acting on the cutting unit from above and below, the upper deflecting wedge consists of an upper movable element with a central and discharge hydraulic channels,with an inclined end surface and is arranged with the possibility of influencing the connecting element of the cutting unit from above, moving the cutting disks outside the housing by rotating the cutting unit around a movable axis, the lower deflector wedge consists of a lower movable element with an inclined end surface and is arranged with the possibility of influencing the connecting element of the cutting unit from below by the inclined end surface, moving the cutting disks inside the housing by rotating the cutting unit around a movable axis, the housing is made with two through oblong holes, located oppositely and made in the side surface of the housing with the possibility of ensuring the movement of the cutting disks outside or inside the housing, and with lateral through holes, the hydraulic monitor nozzles are located in the discharge hydraulic channels of the upper movable element (RU Patent No. 2490434, E21B 43 / 112, published on 20.08.2013, prototype).,

[0011] The disadvantages of the known device include the technological capability of the return mechanism, consisting of two springs, one of which counteracts the pushing force of the weight and the static level of the process fluid located inside the tubing, facilitating the setting of the hydraulic mechanism in the transport position, thereby relieving the load and impact on the piston-pusher, ensuring the exit of the cutting knives from the perforator body; and the second, located below the cutting elements, acts on the piston-pusher to ensure the alignment of the movable axis on which the cutting knives are located. At low reservoir pressure, the force of these springs is insufficient, and the perforator gets stuck in the well.

[0012] A method is known for creating perforation slots in columns, cement stone and rock, which includes lowering a perforator into a well on a tubing string to the perforation site, lowering a ball into the tubing cavity into a seat, blocking the central channel of a piston-pusher and creating a working pressure in the tubing, which ensures the action of liquid on the piston-pusher, moving it progressively along the axis of the device and extending a cutting disk until it stops with the surface being cut to create a longitudinal slot, carrying out a hydromonitor effect of a jet and returning the cutting disk to its original position after the slot has been formed, developing or killing a production well or lifting the casing from it (RU Patent No. 2182221, E21B 43 / 1 14, published 10.05.2002).

[0013] The disadvantages of the known method are that in wells with low reservoir pressure, the return of the cutting unit to its original state during operation is not ensured, which contributes to the tool getting stuck in the well.

[0014] The closest is the Method for implementing hydromechanical slot perforation, which includes lowering the Device into the well on the tubing to the perforation site, installing the casing in the well opposite the perforation interval, creating in the tubing space the calculated pressure of the working fluid, providing an effect on the upper deflecting wedge for its progressive movement downwards along the axis of the casing, the effect of the upper deflecting wedge on the cutting unit from above, moving the cutting disks outside the casing through through oblong holes by rotating around a movable axis, forming in the production or casing string two oppositely located longitudinal slots by reciprocating movement of the casing along the axis of the production or casing string with the cutting disks in the working position, carrying out hydromonitor treatment of the bottomhole formation zone in the places of the formed longitudinal slots with the destruction of the cement layer through hydromonitor nozzles,releasing the pressure of the working fluid in the tubular space of the tubing, moving the cutting discs inside the body 1 when the lower deflecting wedge acts on the cutting unit from below by rotating it around the movable axis, developing or killing the production well or lifting the Device from it (RU Patent No. 2490434, E21B 43 / 112, published on 20.08.2013, prototype).

[0015] The disadvantages of this known method include the fact that in wells with low formation pressure, the cutting unit cannot return to its original position during operation, which can lead to the tool becoming stuck in the well. The installed spring does not allow for adjustment of the return force; the force is constant, and wellbore conditions vary.

[0016] The technical problem addressed by the proposed technical solutions is the efficient implementation of hydromechanical perforation and the expansion of functionality during perforation repair work. The technical result of the proposed technical solutions consists of eliminating the aforementioned deficiencies, increasing the operational reliability of the device, and enhancing the efficiency of perforation repair work (hydromechanical perforation).

[0017] The set result is achieved in that the device for carrying out hydromechanical perforation comprises a housing, hydromonitor nozzles, a cutting unit and a movement mechanism including upper and lower deflecting wedges, the cutting unit is located between the upper and lower deflecting wedges and includes a movable axis, a connecting element and two cutting disks, each of which is designed with the possibility of being placed and secured on the end sections of the connecting element, wherein the connecting element is designed with the possibility of placing and securing two cutting disks on its end sections and with the possibility of placing on the movable axis for rotation around it, the movable axis is fixed in the housing with the possibility of its rotation, the movement mechanism is installed in the housing with the possibility of acting on the cutting unit from above and below, the upper deflecting wedge consists of an upper movable element with a central and discharge hydraulic channels,with an inclined end surface and is positioned with the ability to act on the connecting element of the cutting unit from above, moving the cutting disks outside the housing by rotating the cutting unit around a movable axis, the lower deflector wedge consists of a lower movable element with an inclined end surface and is positioned with the ability to act on the connecting element of the cutting unit from below by the inclined end surface, moving the cutting disks inside the housing by rotating the cutting unit around a movable axis, the housing is made with two through oblong holes, located oppositely and made in the side surface of the housing with the ability to ensure the movement of the cutting disks outside or inside the housing, and with lateral through holes, the hydraulic nozzles are located in the discharge hydraulic channels of the upper movable element, it is provided with at least one piston-pusher,located above the upper deflecting wedge, wherein the piston-pusher is connected to the upper deflecting wedge with the possibility of acting on it, the housing is provided with at least two through openings for a fluid medium located oppositely in the upper part of the housing to ensure the passage of liquid and an end opening located in the lower part of the housing, each lateral through opening is a through oblong slot made with the possibility of passing a hydraulic jet from a hydraulic monitor nozzle, the upper deflecting wedge is provided with an upper piston - pusher, sealed connected to the upper part of the upper movable element in the form of a barrel and the piston-pusher, and an end plate secured to the end inclined surface by means of a fastening element, the lower deflecting wedge is provided with a lower piston - pusher, located in the lower part of the housing under the lower movable element with the possibility of acting on it,the end inclined surface with the end plate of the upper deflector wedge and the end inclined surface of the lower deflector wedge are mounted mirror image to each other, the piston-pusher is provided with a seat located with the possibility of accommodating a ball in it for closing the central hydraulic channel, the housing is made prefabricated or monolithic and is additionally provided with an opening located in the upper part of the side surface and made for accommodating a knock-down valve in it, the cutting disk is additionally provided with outer and inner edges made from durable material by surfacing, the size of the diameter of the piston of the lower piston-pusher is smaller than the size of the diameter of the piston of the upper piston-pusher.

[0018] A method for performing hydromechanical perforation, including lowering the Device into the well on the tubing to the perforation location, installing the housing in the well opposite the perforation interval, creating in the tubing space the calculated pressure of the working fluid, providing an effect on the upper deflecting wedge for its progressive movement downwards along the axis of the housing, the effect of the upper deflecting wedge on the cutting unit from above, moving the cutting disks beyond the housing through through oblong holes by means of rotation around a movable axis, forming in the production or casing string two oppositely located longitudinal slots by means of reciprocating movement of the housing along the axis of the production or casing string with the cutting disks in the working position, carrying out hydromonitor treatment of the bottomhole formation zone in the places of the formed longitudinal slots with the destruction of the cement layer through hydromonitor nozzles,the pressure of the working fluid in the tubular space of the tubing is released, the cutting disks are moved inside the housing by the action of the lower deflecting wedge on the cutting unit from below by rotating it around the movable axis, the development or killing of the production well or the lifting of the Device from it, the creation of the calculated pressure of the working fluid in the tubular space of the tubing is carried out by placing a ball in the seat of the piston-pusher, blocking the central hydraulic channel, the action on the upper deflecting wedge is carried out by means of at least one piston-pusher, wherein the upper deflecting wedge, moving progressively downwards along the axis of the housing, acts on the connecting element of the cutting unit from above by means of the end plate fixed on the end inclined surface, and moves the cutting disks outside the housing, the pressure of the working fluid in the tubular space of the tubing is released to 0 atm,after which the working fluid is pumped into the annulus with the calculated pressure, which enters the lower part of the housing through the end opening, acting on the lower piston - pusher from below and progressively moving it upward, providing an impact from below with the end inclined surface of the lower movable element on the connecting element of the cutting unit, the passage of a hydraulic jet from each hydraulic monitor nozzle is carried out through through longitudinal slots, while additionally flushing the tubing with the Device from dirt is carried out, after which the ball is dropped into the tubing, placing it in the seat of the piston - pusher.

[0019] Fig. 1 shows a device for carrying out hydromechanical perforation, Fig. 2 shows an example of the implementation of a device for carrying out hydromechanical perforation, Fig. 3 shows an axonometry of a device for carrying out hydromechanical perforation.

[0020] Designations on figures:

[0021] 1 - body;

[0022] 2 - upper piston-pusher;

[0023] 3 - central hydraulic channel;

[0024] 4 - hydraulic outlet channels;

[0025] 5 - hydromonitor nozzles;

[0026] 6 - end plate;

[0027] 7 - connecting element;

[0028] 8 - upper movable element;

[0029] 9- cutting discs;

[0030] 10 - piston-pusher;

[0031] 11 - lower movable element;

[0032] 12 - movable axis;

[0033] 13 - end inclined surface;

[0034] 14 - end inclined surface;

[0035] 15 - through holes for fluid;

[0036] 16 - through oblong slots for hydromonitor jets;

[0037] 17- end hole;

[0038] 18 - through oblong holes;

[0039] 19 - lower piston-pusher.

[0040] A device for carrying out hydromechanical perforation (hereinafter referred to as the “Device”) comprises a housing 1, at least two hydromonitor nozzles 5, a cutting unit, at least one piston-pusher 10 and a movement mechanism including upper and lower deflecting wedges. And

[0041] The cutting unit is located between the upper and lower deflecting wedges and includes a movable axis 12, a connecting element 7 and two cutting discs 9, each of which is designed with the possibility of being placed and secured on the end sections of the connecting element 7.

[0042] The connecting element 7 is made of metal, and is designed with the possibility of placing and securing two cutting disks 9 on its end sections, ensuring the rotation of each cutting disk 9 around its axis, and with the possibility of securing on a movable axis 12 for rotation around it, for example, in the form of a shaped plate with rounded end sections and with three holes.

[0043] The movable axis 12 is fixed in the housing 1 with the possibility of its rotation, ensuring the movement of the cutting disks 9 outside or inside the housing 1 (to the working or initial position).

[0044] Each cutting disc 9 is fixed on the connecting element 7 with the possibility of rotation and is additionally provided with outer and inner edges made of durable material by surfacing.

[0045] The movement mechanism is installed in housing 1 with the ability to act on the cutting unit from above and below.

[0046] The upper deflector wedge consists of an upper piston-pusher 2, an upper movable element 8 in the form of a barrel, the upper part of which is made with the possibility of a hermetically sealed connection with the upper piston-pusher 2 by means of a thread and made with a central 3 and outlet 4 hydraulic channels and with an end inclined surface 13 in the lower part, and an end plate 6, made in a shape that ensures its placement and fastening on the end inclined surface 13 by means of a fastening element, for example, by means of a screw.

[0047] The upper movable element 8 is connected to the upper piston-pusher 2 with the possibility of acting by the end plate 6 on the connecting element 7 of the cutting unit from above, and the upper piston-pusher 2 is hermetically connected to the piston-pusher 10 with the possibility of their interaction by means of a threaded connection.

[0048] The central hydraulic channel 3 of the upper deflecting wedge 2 is designed with the possibility of hydraulic communication with the diverting hydraulic channels 4, ensuring the creation of a reactive eroding hydraulic jet for the purpose of eroding the cement stone.

[0049] The hydraulic outlet channels 4 are formed in the side surface of the upper movable element 8 with the possibility of placing and hermetically securing in them the hydraulic monitor nozzles 5 for creating a reactive washing hydraulic jet.

[0050] The lower deflecting wedge consists of a lower piston-pusher 19 and a lower movable element 1 1, made in a cylindrical shape with an inclined end surface 14.

[0051] The lower deflecting wedge is located in the lower part of the housing 1 under the cutting unit with the possibility of acting with the lower piston - pusher 19 on the lower movable element 1 1 for moving it upward and for acting during its movement on the connecting element 7 of the cutting unit by the end inclined surface 14 under the action of the working annular fluid entering the lower part of the housing 1 through the end opening 17. The end inclined surface 13 with the end plate 6 of the upper deflecting wedge and the end inclined surface 14 of the lower deflecting wedge are mirror-mounted with respect to each other (at an angle) in the housing 1, providing the calculated load - the pressure of the working fluid in the tube space from above for moving the cutting disks 9 to the working position (opening the cutting unit) and in the annular space from below for moving the cutting disks 9 to the initial position (closing the cutting unit).

[0052] The piston-pusher 10 and 19 is a double-sided hydraulic cylinder, the movement of the rod of which, under the action of the working fluid, is carried out in two opposite directions, while the calculated pressure of the working fluid in the declared design is ensured taking into account the size of the diameter and stroke of the piston.

[0053] The size of the piston diameter of the lower piston-pusher 19 is smaller than the size of the piston diameter of the upper piston-pusher 2, which ensures the return of the cutting discs 9 to their original position at the calculated pressure of the liquid from the annular space.

[0054] The housing 1 is designed with the possibility of accommodating therein at least one piston-pusher 10, a cutting unit and a movement mechanism.

[0055] The housing 1 is provided with two through oblong openings 18, located oppositely and made in the side surface of the housing 1 with the possibility of ensuring the movement of the cutting disks 9 outside or inside the housing 1, at least two through openings for fluid 15 located oppositely in the upper part of the housing 1 with the possibility of ensuring the passage of working fluid (draining the fluid during the lifting of the Device) for arranging the piston-pusher or piston-pushers 10 in the housing 1, at least two lateral through openings 16, each of which is a through oblong slot made with the possibility of passing a hydraulic jet from the hydromonitor nozzle 5, and an end opening 17 located in the lower part of the housing 1 with the possibility of ensuring the passage of working fluid with the calculated pressure from the annular space,by means of which the progressive movement of the lower piston - pusher 19 is ensured upward to act with the end inclined surface 14 from below on the connecting element 7 of the cutting unit, rotating it around the movable axis 12 and moving the cutting discs 9 into the body 1.,

[0056] Body 1 is made as a prefabricated or monolithic structure.

[0057] The housing 1 is additionally provided with an opening located in the side surface in its upper part and designed to accommodate a knock-down valve, which ensures the draining of the working fluid from the housing 1 when the Device is lifted.

[0058] At least one piston-pusher 10 is located above the upper deflecting wedge, wherein the piston-pusher 10 is hermetically connected to the upper deflecting wedge with the possibility of acting on it to ensure the creation of a calculated load on the upper deflecting wedge to act on the connecting element 7 of the cutting unit to move the cutting discs 9 into the working position.

[0059] The piston-pusher 10 is provided with a seat, located with the possibility of placing a ball in it for closing the central hydraulic channel 3.

[0060] The hydraulic nozzles 5 are located and hermetically secured in the hydraulic outlet channels 4 of the upper movable element 8 by means of a thread.

[0061] Each hydromonitor nozzle 5 is made of low-carbon and with the possibility of placing it inside the hydraulic outlet channel 4 to create a reactive eroding hydraulic jet for the purpose of eroding the cement stone.

[0062] The initial (transport) position of the cutting unit is the position of the cutting discs 9 inside the housing 1.

[0063] The working position of the cutting unit is the position of the cutting discs 9 outside the housing 1 (outside the housing 1), in which two diametrically opposite longitudinal slots are formed, for example, in the production or casing strings, to ensure hydraulic communication between the well tubular space and the productive formation.

[0064] After the formation of two oppositely located longitudinal slots is completed, for example, in the production string, pressure is created in the annular space above the static pressure in the tubing and an effect is exerted on the movement mechanism, returning the cutting discs 9 to the transport position.

[0065] After which the production well is developed or shut down, or the Device is lifted.

[0066] The method for carrying out hydromechanical perforation is carried out as follows.

[0067] Casing 1 is connected to the tubing string. The device is lowered into the wellbore, either into the production string or casing, to the perforation site.

[0068] The casing 1 is installed in the well opposite the perforation interval.

[0069] Additionally, the tubing is flushed with the Device to remove dirt.

[0070] After this, the calculated pressure of the working fluid is created in the tubular space of the tubing, which provides an effect on at least one piston-pusher 10 and, accordingly, on the upper deflecting wedge, for its progressive movement downwards along the axis of the body 1. For this purpose, a ball is placed in the seat of the piston-pusher 10 by dropping the ball into the tubular space of the tubing.

[0071] The ball closes the central hydraulic channel 3, ensuring the creation of the calculated pressure of the working fluid in the tubular space of the tubing above the ball.

[0072] If the tubing with the Device is not flushed of dirt, then the ball is placed in the seat of the piston-pusher 10 before lowering the Device into the well, and after this the Device with the ball on the tubing is lowered into the well: into the production or casing string to the perforation site, placing the body 1 opposite the perforation interval.

[0073] The calculated pressure is created in the tubular space of the tubing above the ball with the working process fluid, providing an impact on at least one piston-pusher 10, progressively moving the upper deflecting wedge downwards along the axis of the body 1.

[0074] The action on the upper deflecting wedge is carried out by means of at least one piston-pusher 10.

[0075] In the process of progressive movement downwards along the axis of the housing 1, the upper deflecting wedge acts on the connecting element 7 of the cutting unit from above by means of the end plate 6, fixed on the end inclined surface 13, and moves the cutting disks 9 beyond the housing 1, rotating the cutting unit around the movable axis 12, pushing the cutting disks 9 into the working position - until they stop with the cut surface of the production or casing string to form two oppositely located longitudinal slots in it.

[0076] Beyond the body 1, cutting disks 9 are extended through the through oblong openings 18 of body 1 and form two oppositely located longitudinal slots in the production or casing string during the reciprocating movement of body 1 downwards along the axis of the production or casing string by means of cutting disks 9, increasing the pressure of the process fluid pumped into the tubular space of the tubing.

[0077] In this case, the cutting discs 9 are additionally provided with cutting edges to increase the efficiency of forming longitudinal slots.

[0078] After the formation of two oppositely located longitudinal slots in the production or casing string, the pressure in the tubular space of the tubing is increased to a pressure that ensures the implementation of hydromonitor treatment, for example, up to 120 atm, and hydromonitor treatment of the bottomhole formation zone is carried out with the destruction of the cement ring and / or rock behind the string in the places of the formed longitudinal slots with the destruction of the cement layer - behind-the-casing cement through hydromonitor nozzles 5 by means of a hydraulic jet.

[0079] The hydraulic fluid jet exits the jet nozzles 5 at a velocity sufficient to crush the cement sheath and rock behind the production string or casing along the entire length of the longitudinal crack. The distance between the jet nozzle 5 and the cutting unit axis remains constant. The pressure in the tubing is then reduced to 0 atm.

[0080] The passage of a hydraulic jet from each hydraulic monitor nozzle 5 is carried out through through oblong slots 16.

[0081] After the pressure of the working fluid in the tubular space of the tubing has been reduced to 0 atm, the working fluid is pumped into the annular space at the design pressure, which enters the lower part of the housing 1 through the end opening 17 and ensures the movement of the lower deflecting wedge upward, acting on the lower piston - pusher 19 from below and progressively moving it upward, ensuring the action from below of the end inclined surface 14 of the lower movable element 11 on the connecting element 7 of the cutting unit.

[0082] In the process of progressive movement upward along the axis of the housing 1, the lower piston - pusher 19 acts on the lower movable element I, which with its end inclined surface 14 acts on the connecting element 7 of the cutting unit from below, moves the cutting disks 9 inside the housing 1 by rotating the cutting unit around the movable axis 12, removing the cutting disks 9 inside the housing 1 to the original position.

[0083] The production well is then completed or killed, or the device is lifted by moving the housing 1 upward along the axis of the production or casing string with the cutting discs 9 in their original position. The stated technical solutions enhance the operational reliability of the device and improve the efficiency of perforation repairs (hydromechanical perforation), including in wells with low formation pressure, by ensuring the cutting unit is returned to its original position during operation.

[0084] Example.

[0085] Before lowering the tool into the well (178mm production casing, Garib formation, Arab Republic of Egypt), the ball is placed in the seat of the piston-pusher 10, also blocking the central hydraulic channel 3 of the upper deflector wedge. After this, the housing 1 is connected to the tubing, housing three piston-pushers 10 and six hydraulic nozzles 5.

[0086] On the tubing, a device with a ball is lowered into the well - into the production casing to the perforation site.

[0087] The housing 1 is installed in the well opposite the perforation interval, a process fluid pressure of 20 atm is created in the tubular space of the tubing above the ball (not shown in the figure), which acts on the piston-pusher 10 and from above on the upper deflecting wedge, progressively moving it downwards along the axis of the housing 1.

[0088] During the progressive movement of the upper deflector wedge downwards, the pressure of the process fluid is increased to 60 atm. for its further lowering and acting on the connecting element 7 in the form of a shaped plate with rounded end sections and with three holes on top by means of the end plate 6, fixed on the end inclined surface 13, and moves the cutting disks 9 beyond the body 1 through the through oblong holes 18, rotating the cutting unit around the movable axis 12.

[0089] Two oppositely positioned longitudinal slots are formed in the production string by reciprocating the housing 1 downward along the axis of the production string using cutting discs 9, increasing the pressure of the process fluid pumped into the tubing space to 80 atm. After the two oppositely positioned longitudinal slots are formed in the production string, the pressure of the process fluid in the tubing space is increased to a pressure of 10 atm, and a hydromonitor treatment is carried out using hydraulic jets, breaking the cement ring behind the production string at the locations of the formed longitudinal slots through six hydromonitor nozzles 5.

[0090] The hydraulic jet from each jet-monitor nozzle 5 is passed through oblong through-slots 16. After jet-monitoring, the process fluid pressure in the tubing space is reduced to 0 atm, and process fluid is pumped into the annulus at a pressure of 50 atm. The process fluid enters the lower part of the housing 1 through end opening 17 and moves the lower deflection wedge upward, acting on the lower deflection wedge from below.

[0091] In the process of progressive movement upward along the axis of the housing 1, the lower deflecting wedge acts with the end inclined surface 14 on the connecting element 7 of the cutting unit from below, moves the cutting discs 9 inside the housing 1, rotating the cutting unit around the movable axis 12 to the initial position.

[0092] Then the device with the ball on the tubing is turned in the production string by 90° and two more oppositely located longitudinal slots are formed in the production string using the method described above.

[0093] After the formation of four longitudinal slots in the production casing, the development of the production well is carried out using known methods and means.

[0094] The stated technical solutions allow for the expansion of functionality during perforation repair work, increase the operational reliability of the Device, and the efficiency of hydromechanical perforation repair work, including by ensuring the return of the cutting unit to its original state during operation.

Claims

The AMENDED CLAUSE OF THE INVENTION was received by the International Bureau on June 26, 2025 (06 / 26 / 2025) 1. A device for carrying out hydromechanical perforation, comprising a housing, hydromonitor nozzles, a cutting unit and a movement mechanism including upper and lower deflecting wedges, the cutting unit is located between the upper and lower deflecting wedges and includes a movable axis, a connecting element and two cutting disks, each of which is designed with the possibility of being placed and secured on the end sections of the connecting element, wherein the connecting element is designed with the possibility of placing and securing two cutting disks on its end sections and with the possibility of placing on the movable axis for rotation around it, the movable axis is secured in the housing with the possibility of its rotation, the movement mechanism is installed in the housing with the possibility of acting on the cutting unit from above and below, the upper deflecting wedge consists of an upper movable element with a central and discharge hydraulic channels,with an inclined end surface and is positioned with the possibility of acting on the connecting element of the cutting unit from above, moving the cutting disks outside the housing by rotating the cutting unit around a movable axis, the lower deflecting wedge consists of a lower movable element with an inclined end surface and is positioned with the possibility of acting on the connecting element of the cutting unit from below by an inclined end surface, moving the cutting disks inside the housing by rotating the cutting unit around a movable axis, the housing is made with two through oblong holes, located oppositely and made in the side surface of the housing with the possibility, providing movement of the cutting discs outside or inside the housing, and with lateral through holes, the hydraulic monitor nozzles are located in the outlet hydraulic channels of the upper movable element, characterized in that it is provided with at least one piston-pusher located above the upper deflecting wedge, wherein the piston-pusher is connected to the upper deflecting wedge with the possibility of acting on it, the housing is provided with at least two through holes for fluid located oppositely in the upper part of the housing to ensure the passage of liquid and an end hole located in the lower part of the housing, each lateral through hole is a through oblong slot made with the possibility of passing a hydraulic jet from the hydraulic monitor nozzle, the upper deflecting wedge is provided with an upper piston-pusher,hermetically connected to the upper part of the upper movable element in the form of a barrel and a piston-pusher, and an end plate secured to the end inclined surface by means of a fastening element, the lower deflecting wedge is provided with a lower piston-pusher, located in the lower part of the housing under the lower movable element with the possibility of acting on it, the size of the diameter of the piston of the lower piston-pusher is smaller than the size of the diameter of the piston of the upper piston-pusher, the end inclined surface with the end plate of the upper deflecting wedge and the end inclined surface of the lower deflecting wedge are mirror-imaged in relation to each other, the piston-pusher is provided with a seat located with the possibility of, placing a ball in it to block the central hydraulic channel.

2. A device for carrying out hydromechanical perforation according to paragraph 1, characterized in that the housing is additionally provided with an opening located in the upper part of the side surface and designed to accommodate a knock-down valve.

3. A device for carrying out hydromechanical perforation according to paragraph 1, characterized in that the cutting disk is additionally provided with outer and inner edges made from a durable material by welding.

4. A device for carrying out hydromechanical perforation according to paragraph 1, characterized in that the body is made prefabricated or monolithic.

5. A method for performing hydromechanical perforation, including lowering the Device into the well on the tubing to the perforation site, installing the casing in the well opposite the perforation interval, creating in the tubing space the calculated pressure of the working fluid, providing an effect on the upper deflecting wedge for its progressive movement downwards along the axis of the casing, the effect of the upper deflecting wedge on the cutting unit from above, moving the cutting disks beyond the casing through through oblong holes by means of rotation around a movable axis, forming in the production or casing string two oppositely located longitudinal slots by means of reciprocating movement of the casing along the axis of the production or casing string with the cutting disks in the working position, carrying out hydromonitor treatment of the bottomhole formation zone in the places of the formed longitudinal slots with destruction cement layer through the hydraulic nozzles, releasing the pressure of the working fluid in the tubular space of the tubing, moving the cutting disks inside the body 1 when the lower deflecting wedge acts on the cutting unit from below by rotating it around a movable axis, developing or killing the production well or lifting the device from it, characterized in that the creation of the calculated pressure of the working fluid in the tubular space of the tubing is carried out by placing a ball in the seat of the piston-pusher, blocking the central hydraulic channel, the action on the upper deflecting wedge is carried out by means of at least one piston-pusher, wherein the upper deflecting wedge, moving progressively downwards along the axis of the body, acts on the connecting element of the cutting unit from above by means of an end plate fixed on the end inclined surface, and moves the cutting disks outside the body,the pressure of the working fluid in the tubular space of the tubing is released to 0 atm, after which the working fluid is pumped into the annular space at the calculated pressure, which enters the lower part of the housing through the end opening, acting on the lower piston pusher from below and progressively moving it upward, ensuring the action from below of the end inclined surface of the lower moving element on the connecting element of the cutting unit, the passage of the hydraulic jet from each hydraulic monitor nozzle is carried out through through oblong slots.

6. A method for carrying out hydromechanical perforation according to paragraph 5, characterized in that the tubing with the Device is additionally flushed of dirt, after which a ball is dropped into the tubing, placing it in the seat of the piston-pusher.

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